ECU
Transcript: One of the fist uses of electronic engine management Other parameters that are often mappable are: Ignition Timing: Rev. limit: Water temperature correction: Transient fueling: Closed loop lambda: Wastegate control: Staged injection Some of the more advanced standalone/race ECUs include functionality such as launch control, operating as a rev limiter while the car is at the starting line to keep the engine revs in a 'sweet spot', waiting for the clutch to be released to launch the car as quickly and efficiently as possible. Flashing" the chip involves electronically erasing the read only program and replacing it with new, updated information (the engine control 'map'). Typically, when an ECU is flashed, a new map is provided that allows the engine to run 'hotter,' providing more Horsepower, altered valve timing, etc. This often makes the car faster, but can decrease its reliability and durability. What can a faulty ECU do to a car? Or buy a new one Easier Design and Manufacturing Simplified Wiring Safety, Comfort and Convenience-airbags and ABS This can make it easier for technicians to diagnose problems with the car, especially intermittent problems, which are notorious for disappearing as soon as you bring the car in for repairs. Hybrid digital/analog designs were popular in the mid 1980s "Kommandogerät" These units do not have a fixed behavior and can be reprogrammed by the user Points and condenser Then a system that used a look-up table stored in a digital ROM chip to yield precomputed output values was used How does it work What can it do ? Control of Air/Fuel ratio Control of ignition timing Control of idle speed Control of variable valve timing Electronic valve control Controlling the engine is the most processor-intensive job on your car, and the engine control unit (ECU) is the most powerful computer on most cars. The ECU uses closed-loop control, a control scheme that monitors outputs of a system to control the inputs to a system, managing the emissions and fuel economy of the engine (as well as a host of other parameters). Used when a significant aftermarket modifications has been made to a vehicle's engine like adding turbo chargers, exhaust systems A Bit of History Advantages of using ECU'S BMW used this in 1939 for their 14 Cylinder radial aviation engine A big benefit of having a electronic communications in a car is that each module can communicate faults to a central module, this stores the faults and can communicate them to an off-board diagnostic tool. Today ECUs use a microprocessor which can process the inputs from the engine sensors in real time Thanks for watching There can be many different symptoms that can arise from a ECU that has failed. Misfires, low power, engine surges , rough idle, non-starting, poor fuel economy, are just a few Programmable ECUs ECU engine control unit Before emissions laws were enacted, it was possible to build a car engine without microprocessors Advanced Diagnostics
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